Jonathan Jones: A restored Black on Maroon is back in the place where it was vandalised 18 months ago. But is it the atmosphere of this noisy, pop-cultural gallery that incites irreverence towards art?

Jonathan Jones: Calm down, dears, the Tate is renewing its sponsorship deal with BP. But before you join the BP-Tate haters, stop and think about how else galleries are supposed to survive funding cuts